carson



PATENTED MAR. 14, 1905. w. L. CARSON.

TOOL

APPLICATION FILED HAY 24, 1904.

2 SHEETS-SHEET 1.

q vihwowo attozuoq PATENTED MAR.14, 1905.- W. L. CARSON.

TOOL.

APPLIOATION FILED my 24, 1904.

Z-BHEBTE-BHEET 2 1 UNITED STATES Patented March 14., 1905.

PATENT OFFICE.

TOOL.

SPECIFICATION forming part of LettersPatent No. 784,984, dated March 14, 1905.

Application filed May 24, 1904. Serial No. 209,522.

To all 11171.01, 71/; 'I'I7/(TLZ/ (3072087771:

Be it known that 1, WILLIAM L. CARsoN, a citizen of the United States, residing at Seattle, in the county of King and State of VVashington. have invented new and useful Improvements in Tools, of which the following is a specification.

This invention relates to a tool adapted to be attached to the tail-stock of a lathe for holding certain cutting implements which are to be brought successively into working position that they may operate in a predetermined manner on a piece of work (secured to the chuck or face-plate of the lathe) to produce by their combined action a desired re sult as, for instance, to accurately place, bore, and countersink centers.

My object is to produce a tool for the purpose above described which shall be simple and light in construction and operation, readily attached to the tail-stock of any form of lathe, and to perform the function demanded of it in a quicker and more accurate manner than in other devices known to me.

Referring to the accompanying drawings, Figure 1 represents a side elevation of my turret-centering tool, a portion of the same being broken away. Fig. 2 is a plan View looking in the direction of the arrow 1, Fig. 1, a part being in section. Fig. 3 is a. view in vertical section on the line 3 3, Fig. 2. Fig. ais a bottom plan View. Fig. 5 is a bottom plan view of a certain detail part of my invention. Figs. 6 and 7 are perspective views of other detail parts.

Similar letters of reference are employed to indicate corresponding parts in all the figures of the drawings.

1 center of the head A is screwed in an axial position a pin or stub-shaft D, projecting beyond the head A on both sides, its lower part D acting as a bearing for the rotatable turret E, carrying a plurality of tools projecting outwardly therefrom. The under surface of attached thereto, and near the head A is formed a socket D in which a finger H is pivoted. I

The outer end H of the finger extends laterally and lies in an inclined position crosswise of the finger, as clearly represented in Figs. 1,. 2, and 6. finger H falls by gravity; but, if desired, a spring may be applied thereto.

7 I represents a dog (shown in detail in Fig. 7) comprising a head I, having an inner side provided with a horizontally-inclined flange 2', a locking-pin 1 extending downwardly from the head, and a small pin J, headed on its lower end and having its upper end fixed in the head 1. Surrounding the small pin J is a spiral spring J, adapted when in position to return the dog I.

The head A has formed therein two openings K and L (see Fig. 5) parallel to its axis. The former opening passes entirely through the head, while the latter opening extends nearly through it. Through the opening K the locking-pin 1 is passed from the outside,

projecting a short distance beyond the bottom face of the head A and adapted to enter a seat 6, formed in the turret E, to lock it securely against turning. The small pin J, with its spring J, is placed in the opening Lfrom below, its upper end passing through a holel into the head I of the dog and fastened thereto, the spring being under tension and the head j of the small pin J resting on the turret E.

Four centering-tools M, N, O, and P are fixed in the turret E. The number may be varied as the work to' be performed demands;

but the number shown is sufiicient for center- ,ing purposes in the great majority of cases.

In operating my invention the arbor C is As shown in the drawings, the

' wring-tool M will be pressed against the revolving work and prick a small hole therein.

' Now by drawing. the tool back slightly the operator grasps the handle G and turns it to the left. The pin D being thus operated, the inclined head H of the pivotal finger H passes under the inclined flange t' on the dog I, lifting it and disengaging the locking-pin 1 from its seat 0 inthe turret E. About this time one of the teeth of the ratchet-disk D on the lower end of the pin D strikes the pawl F and moves the turret until the nexttool N is broughtinto operative position. Just before this has occurred thehead of the finger H will have passed from under the flange 6, thereby freeing the dog I, which is immediately drawn down by the spring J so that the locking-pin 1 will enter the next approaching seat 6 on the advancing turret and lock the turret in the position shown in Fig. 3, with the drill N in working position. The handle G isafterward returned to its first position, the linger H riding over the flange e? on the dog. The tail-spindleis again run forward, the point of the drill N entering the puncture heretofore made by the tool M and drilling a hole in the work to the depth required-about one-quarter inch. The tool is then withdrawn and the turret again moved until the center reamer ()is brought into position to ream the hole to the proper shape. Finally the flat square-end drill is brought forward to countersink the center slightly below the surface to protect its edges from inury.

A feature of the invention not heretofore mentioned relates to the connection between the stub-shaft D and the head A. As heretofore stated, the stub-shaftD is screwed into the head A and, as may be seen in Fig. 3, by a right-hand screw-thread. When the stubshaft D is in position indicated in Fig. 3, it serves as a clamping-bolt to hold the turret E firmly against the head A and remove all strain from the locking-pin 1 but when the handle G is turned to the left to disengage.

the locking-pin from and rotate the turret the shaft D is moved axially downward by means of the screwthread, thereby lowering the turret slightly and permitting its easy rotation.

From the foregoing description it will be apparent that a quarter-rotation of the stubshaft D in one direction by means of the lever G will cause the turret to be unlocked, loosened from the head A, rotated, and relocked, and a quarter-rotation of the stubshaft in the opposite direction-that is, back to its original position-will cause the turret to be tightened against the head A by the action of the screw-threads on said stub-shaft.

Having thus described the invention, what is claimed as new is- A lathe-tool comprising a head having a threaded bore, a stub-shaft threaded through said bore, a linger pivoted on said stub-shaft, a spring actuated locking dog extending through said head on a line parallel with the of said stub-shaft, and being adapted to be engaged by said linger, a turret mounted on said stub-shaft and having sockets adapted to be engaged by said locking-dog, and a ratchet connection between said turret and stub-shaft, whereby, when the stub-shaft is rotated in one direction, the turret is unlocked, loosened from the head, rotated, and relocked, and when the stub-shaft is rotated in the opposite direction, theturret is tigl'itened against the head.

In testimony whereof I ailix my signature in presence of two witnesses.

IIL'LIAM L. lARSON. Witnesses:

UnAs. .l-I. Mons, J'No. H. Sonun'rneis. 

